127733721 has 16 divisors (see below), whose sum is σ = 174261120. Its totient is φ = 83203200.

The previous prime is 127733707. The next prime is 127733729. The reversal of 127733721 is 127337721.

It is not a de Polignac number, because 127733721 - 2⁵ = 127733689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (127733729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21196 + ... + 26546.

It is an arithmetic number, because the mean of its divisors is an integer number (10891320).

Almost surely, 2^127733721 is an apocalyptic number.

It is an amenable number.

127733721 is a deficient number, since it is larger than the sum of its proper divisors (46527399).

127733721 is a wasteful number, since it uses less digits than its factorization.

127733721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5536.

The product of its digits is 12348, while the sum is 33.

The square root of 127733721 is about 11301.9343919526. The cubic root of 127733721 is about 503.6187080545.

The spelling of 127733721 in words is "one hundred twenty-seven million, seven hundred thirty-three thousand, seven hundred twenty-one".